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Combines used to harvest crops can also carry unwanted weed seeds between fields. This video demonstrates a top-to-bottom front-to-back procedure for cleaning a combine to help prevent the spread of weed seeds. Daniel H. Smith and Kevan Jarek, both University of Wisconsin agricultural specialists, talk you through various steps from putting on protective gear, to opening all the access panels where weed seeds may be hiding, to using compressed to remove plant material both inside and outside of a combine.